The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate

Lovering, Kaitlin; Nayak, Srikanth; Bu, Wei; Uysal, Ahmet

doi:10.1021/acs.jpcc.9b09288

Title: The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate

Journal Article · 04 December 2019 · Journal of Physical Chemistry. C

DOI: https://doi.org/10.1021/acs.jpcc.9b09288 · OSTI ID:1606542

Lovering, Kaitlin ^[1]; Nayak, Srikanth ^[1]; Bu, Wei ^[2];

^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, IL (United States). NSF’s ChemMatCARS

The selective transport of trivalent rare earth metals from aqueous to organic environments with the help of amphiphilic "extractants" is an industrially important process. When the amphiphilic extractant is positively charged or neutral, the coextracted background anions are not only necessary for charge balance but also have a large impact on extraction efficiency and selectivity. In particular, the opposite selectivity trends observed throughout the lanthanide series in the presence of nitrate and thiocyanate ions have not been explained. To understand the role of background anions in the phase transfer of lanthanide cations, in this work we use a positively charged long-chain aliphatic molecule, modeling a common extractant, and gain molecular level insight into interfacial headgroup-anion interactions. By combining surface sensitive sum frequency generation spectroscopy with X-ray reflectivity and grazing incidence X-ray diffraction, we observed qualitative differences in the orientational and overall interfacial structure of nitrate and thiocyanate solutions at a positively charged Langmuir monolayer. Though nitrate adsorbs without dramatic changes to the solvation structure at the interface or the monolayer ordering, thiocyanate significantly alters the water structure and reduces monolayer ordering. We suggest that these qualitatively different adsorption trends help explain a reversal in system selectivity toward lighter or heavier lanthanides in solvent extraction systems in the presence of nitrate or thiocyanate anions.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; NSF/CHE-1834750

OSTI ID:: 1606542

Journal Information:: Journal of Physical Chemistry. C, Vol. 124, Issue 1; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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